Metalworker&#39;s tool



April,-7, 1942.

NI. c. HERGET METALWORKERS TOOL Filed April 2, 1941' 2 mm C MM Mw NEYSPatented Apr. 7, 1942 METALWORKERS TOOL Marvin C. Herge't,Williamsville, N. Y., assignor to Bell Aircraft Corporation, Buffalo, N;Y.

Application April 2, 1941, Serial No. 386,504

3Claims. .(01. 17-735) This invention relates to metal working tools andmore particularly to a compact, self-contained metalworking tooldesigned for manual operation. r a

While analogous occur :to those skilled in the art concerned, I shalldiscuss the tool of my invention in connection with an arrangement ofelements which adapts itself especially to the removal of annular burswhich are ordinarily left around a drilled hole at the surface ofa workpiece at the side thereof where the drill emerges from such work piece.Such burs are generally objectional for obvious reasons but they presenta particular problem where a great many holes'are drilled;

as, for instance, in aircraft fabrication, and where it is subsequentlyintended to assemble work pieces by riveting through suchholes. Burswill then either prevent proper seating of the rivet head -or preventintimate contact between -what should be abutting surfaces of adjacentsheets or blocks of material.

The device of the present invention is sufiiciently compact and portableand easy to use to I permit a workmanto have the tool at hand whileaccomplishing other related steps in the fabrication of metal parts,ready for quick and convenient use in the removal of burs as theoccasion for such removal arises. The device of my invention is simplein construction and yet ade- 'quate and effective in accomplishing thedesired purpose. The tool is of sufficiently small compass to permitconvenient carrying thereof in a workmans pocket.

In the preferred form a bur-removing tool in the nature of a bit isarranged to be rotated by simple manipulative movement of the hand .ofthe workman and the design and construction of the tool is such that'theuse of only one hand is required for complete operation thereof. Inmodified form my new tool may be arranged for operative rotation in onedirection only, if desired. The design of my improved tool may bemodified to provide interchangeability of bits.

-Practical examplesof devices embodyingthese' features are shown in thedrawing and will hereinafter be described in detail.

Preferred forms of the new tool of my invention are illustrated in theaccompanying drawing and the ensuing description. It is to beunderstood, however, that specific embodiments are set forth merely byWay of example and the principles of my invention are not to beconsideredjas limited in their application, otherwise than as defined in-the appended claims.

uses of I theinstant tool willei whereby it may be conveniently securedagainst tionary manner.

welding, or the like. In the forms illustrated in and the spindle II.

In the drawing:

Fig. 1 is an elevational view of one form of bur-removing toolconstructed in accordance with the principles of my invention and shownin operative relationship with respect to a previously drilled workpiece;

Fig. 2 is a transverse cross-sectional'view on the line 22 of Fig. 1;

Fig. 3 is an enlarged cross-sectional view of the lower or bit portionof a modified form of the tool of my invention taken in a plane parallelwith the axis thereof; and,

Fig. 4 is a transverse cross-sectional view taken on the line 44 of Fig.3.

In the drawing and throughout the ensuing description like, charactersof reference denote 'like parts and the numeral l0 designates a sleevewhich is provided with an axial bore in which is journaled a stem orspindle II. The spindle ll extends from the opposite ends of the sleeveI0 and'at one such extending end it has secured thereto abur-removingbit 12, as by means of a pin I3 extending transversely through the bitIn form, the bit I2 is similar to a conventional counter-sinking bit and'has a fluted conical cutting portion whose angle may be selected tobest suit the nature of the work in hand. A fiber thrust collar 14 isinterposed between the end surface of the sleeve l0 and the adjacentradial face of the bit [2.

In Fig. 1 a work piece of metal, or the like, is designated A and suchworkpiece is shown as having a hole B which has previously been drilled.The bur which is'usually found at the side of the workpiece from whichthe drill bit emerges is indicated schematically at C. It is in theremoval" of this bur that the improved tool of my invention is intendedto be employed in the present instance.

Novel means are provided for conjointly handling and supporting my newtool and for producing rotation of the bit l2 upon proper manipulationof such handling and supporting means. To

this end the tool is provided with a pair of opposed handle members, oneof which is relatively stationary and is designated generally l6 and theother of which is movably mounted and is designated generally IT. Thehandle member l6 has a securing portion l8 which is preferably elongateand of arcuate transverse cross-section the side wall of the sleeve inin a rigid and sta- Such securement may be by the drawing, the lowerterminus of the securing portion I8 is annular and encircles the sleeveI as at I9.

The upper portion of the handle member I6 is through the body of thehandle member I! shaped and formed to be conveniently grasped coming incontact with the drive means, and,, further, cooperates to providealedge to more conveniently receive downward thrust of the hand of anoperator than when mere friction of the hand against lied upon.

the handle portion 20 is remember IS.

The movable handle membenll. is provided with handle means 24corresponding to and .00- operating with the handle portion 26 of themember I6. The handle member I! likewise has-an intermediate bulge 25corresponding to,

and functioning in cooperation with the bulge 22 of. the handle memberI6. The handle member I'I extends downwardly and terminates in a pair oftrunnions 26 which are arranged for pivotal securement to the sleeve I0,preferablyadjacent the lower portion thereof, as by means of pivot pins21. The transverse section of the lower portion of the handle memberI'I-isarcuate, like that of: the portion I8 of the member I6, tocorrespond to the curvature of the outside of the sleeve ID. Thetrunnions 26 may be conveniently formed by merely providing. extensionsin the nature of the ears at the lower longitudinal edges of sucharcuate cross-section.

A drive pinion 30 is secured to the upper extension of the spindle IIfor rotation therewith and a rack bar 32 is supported at one end. by thepivotal handle member I! in such manner that pivotal movement of thehandle member about the pivot pins 21 produces oscillation of the rackbar and consequent rotation of the spindle II bysvirtue of theengagement of the teeth of the rack bar 32 with the pinion 30. The

rack bar is preferably curved to approximately conform to an arc struckfrom the pivot pins 21 of the handle member I1 to form,'in effect, a

segment of a crown gear. It will be noted that substantial relativeaxial movement of the spindle II in the sleeve I0 is limited bycooperation between the pinion 30 and the work bit I2 secured,

respectively, to opposite ends of the spindle I I. For supporting andguiding the oscillation of the rack bar 32, and to unify and render more.and supports the latter against displacement from engagement withthepinion 30. The block 33 has a lateral extension 36 which ispreferably shaped to conform to the inner surface of the handle memberI6 adjacent the bulge 22, and is secured thereto by means 'of a screw31, or the like. This construction very effectively braces the handlemember IS with respect to the sleeve "III. a

' The end of the rack bar 32, which is operatively engaged to thepivotal handle member I'I, re-

ceives a screw 39 which preferably passes loosely" desired manner.

whereby the rack bar 32 may adjust itself to compensate for necessaryangular deviations.

The handle members I6 and I! are normally held resiliently apart by acompression coil spring 40 whose opposite ends are guided by pins II and42 secured, respectively, to the opposite handle members I6 and I1. Inother words, the spring '40 serves .to urge the pivotal handle member I!in a counterclockwise direction about its pivot pins '21. Such pivotalmovement of the handle 1 member I1 under the impetus of the spring 40 islimited by engagement of the lower edge of the handle member I1 againstthe upper radial face of the circular lower portion I9 of the handleItis believed that operation of the device illustrated in Figs. 1 and 2will be obvious from the foregoing description. The handle members I6and I1 are grasped in the hand of the operator and, after the tool hasbeen placed in-enga'gement of a, drilled hole, the handles arecompressed'toward each other and, through the rack bar 32, the,pinionr3ll, thespindle II and the bit I2v are given a clockwise rotationaswiewed from above. This is the working or cutting stroke in theparticular embodiment now being discussed. vIt is to be understood thatthe term cutting is used in this application as generic to cutting,milling, abrading, or otherwise removing portions of a piece ofmaterial.

Upon release of-the handle members 20 and '24. the spring 40 moves theparts to their initial position, as illustrated in Figs. 1 and 2. Onthis idle return stroke the tool may be left in engagement over anopening it morethan a single cutting stroke is required in theparticular case.

In the embodiment illustrated in Figs. 3 and 4,

two variations of. the construction of Figs. 1

and 2 are incorporated. One of these is the provision of means forreadily substituting and re placing cutting bits. The second of thesevariations is the provision of unidirectional drive means. It is to beunderstood that these two variations are independent and either of themmay be incorporated in the basic device illustrated in the modificationof Figs. 1 and 2 withoutthe other. In Fig. 3 the element designated 50corresponds to the sleeve In of Figs. 1 and .2; the element 5|corresponds to the lowersleeve encircling portion I9 of the handlemember I B; and the spindle 52 is like the spindle II, excepting for thedifierences noted herein. In the embodiment of Fig. 3 a bit '53,.otherwise like the bit I2 of Figs. 1 and 2, has an upper annular flange54 which is internally threaded to engage complementarythreads formed ona collar 55 which is disposed upon the spindle 52 adjacent its lower endand held in assembled position by means of a nut 56 which engages thelower terminal portion of the spindl 52, the latter being appropriatelythreaded therefor.

The upper face of the collar 55 engages against the lower end of thesleeve 50 and is provided with a cup-like depression having internalratchet teeth 51 extending therearound.

The spindle 52 has rigidly associated therewith a pair of spacedtrunnions 58 which receive therebetween a ratchet pawl 59. The trunnions58 may .be formed integrally with the spindle 52 as shown or may besecured theretoin any A pin 60 is preferably provided to'pivotallysupport the pawl 59 with respect to the trunnions 58 and a leaf spring8| may conveniently .be secured to the surface of the spindle 52 bymeans of a screw 62. The free end of the spring 6| bears against thepawl 59 in such manner as to urge its free terminal portion resilientlyinto engagement with the ratchet teeth 51.

From the foregoing it will be apparent that, in this form of the device,only clockwise movement of the spindle 52 will be operativelytransmitted to the collar 55 and, consequently, to the bit 53.Counterclockwise return movement of the spindle 52 will be idle, andresult only in the riding of the pawl 59 along the ratchet teeth 51.

The bit 53 of the embodiment of Figs. 3 and 4 may be removed andreplaced by a bit of another form by merely unscrewing the bit fromengagement with the collar 55. To this end the upper cylindrical face ofthe bit 53 may be knurled or provided with spanner holes, or the like,to facilitate disengagement, if desired.

It will be noted that in the forms illustrated all operative parts ofthe device, excepting of course the bit itself, are enclosed between theopposed handle elements and are entirely confined to the space directly.between such handle members. The contribution to safety in use and theprotection afforded the working parts of the device by virtue of thisconstruction are obvious. It will be noted that the sleeve In, thehandle member [6, and the block 33 are rigidly assembled with respect toeach other. The construction shown is extremely practical and economicalbut it will be noted that these elements might be integrally formed ifmanufacturing practice so indicated, without altering the otherstructural and functional features of the device. I

It will further be noted that the general configuration of the tool ofmy invention is such that its nose, adjacent the bit, may be inserted inrestricted spaces, such as might be presented when holes to be operatedupon are located in the bottoms of channels, or the like.

What is claimed is:

1. In a hand tool for metal workers, a supporting sleeve, a work shaftdisposed therein and extending therefrom at opposite ends of saidsleeve, a metal cutting bit carried by the extension of said shaft atone end of said sleeve for rotation with said shaft and a pinion securedto the extension of said shaft at the other end of said sleeve, a handleelement rigidly associated with said sleeve and extending therefrom atthe pinion end of said sleeve, a second handle element pivotallyattached to said sleeve at a point spaced axially along said sleeve fromsaid pinion, said second handle element extending toward and beyond saidpinion to present a handle portion opposed to said first handle element,and a rack bar secured at one of its ends to said second handle elementand extending therefrom into engagement with said pinion whereby thelatter is rotated by pivotal movement of said second handle element torotate the shaft and the cutting bit carried thereby.

2. In a hand tool for metal workers, an elongate supporting sleeve, 2.work shaft disposed therein and extending therefrom at opposite ends ofsaid sleeve, a metal cutting bit carried by the extension of said shaftat one end of said sleeve for rotation with said shaft and a pinionsecured to the extension of said shaft at the other end of said sleeve,a handle element rigidly associated with said sleeve and extendingtherefrom at the pinion end of said sleeve and in the general directionof extent of said sleeve, a second handle element pivotally attached tosaid sleeve adjacent the cutting bit end thereof, said second handleelement extending beyond the pinion end of said sleeve to present ahandle portion opposed to said first handle element, and a rack barsecured at one of its ends to said second handle element and extendingtherefrom into engagement with said pinion whereby the latter is rotatedby pivotal movement of said second handle element to rotate the shaftand the cutting bit carried thereby.

3. In a hand tool for metal workers, a body member, a Work shaftdisposed therein and extending therefrom at opposite ends of said bodymember, a metal cutting bit carried by said shaft at one end of saidbody member and a pinion secured to said shaft at the other end of saidbody member, a handle element rigidly associated with said body memberand extending therefrom at the pinion end thereof in the generaldirection of extent of the axis of said work shaft, a second handleelement pivotally attached to said body member at a point spaced axiallyfrom said pinion, saidsecond handle element extending beyond the pinionend of said body member to present a handle portion opposed to saidfirst handle element, and a rack bar secured at one if its ends to saidsecond handle element and extending therefrom into engagement with saidpinion whereby the latter is rotated by pivotal movement of said secondhandle element to rotate the shaft and the cutting bit carried thereby,both of said handle members having outward lateral extensions in theregion of said pinion to provide ledges for guarding the hand of theoperator and for receiving downward thrust.

MARVIN C. HERGET.

